Magnesium-based hydrogen storage material of core-shell structure and preparation method of the magnesium-based hydrogen storage material

A technology of core-shell structure and hydrogen storage materials, applied in metal processing equipment, transportation and packaging, etc., can solve undiscovered problems, achieve the effects of improving hydrogen absorption and desorption performance, improving kinetic and thermodynamic performance, and reducing temperature

Active Publication Date: 2016-06-08
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0005] It is found from comprehensive literature that before the completion of the present invention, no reports have been found that titanium metal alkoxides are used to directly prepare titanium oxide-coated magnesium particle materials in ethanol by sol-gel method

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  • Magnesium-based hydrogen storage material of core-shell structure and preparation method of the magnesium-based hydrogen storage material
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  • Magnesium-based hydrogen storage material of core-shell structure and preparation method of the magnesium-based hydrogen storage material

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[0029] The invention discloses a method for preparing a magnesium-based hydrogen storage material with a core-shell structure, the preparation method comprising the following steps:

[0030] Step 1, preparing a precursor solution of a certain concentration, and ultrasonically mixing it with a certain mass of magnesium particles to obtain a suspension of magnesium particles;

[0031] Step 2. Slowly add 95% ethanol solution dropwise to the suspension of the above-mentioned magnesium particles under the condition of vigorous stirring, and let it stand for 12 hours, and the titanium metal alkoxide undergoes hydrolysis reaction to form titanium hydroxide, which is coated on the surface of magnesium particles;

[0032] Step 3: Centrifuge and wash the suspension obtained in the above steps, and keep the obtained sample at 400° C. under vacuum conditions for 12 hours to obtain a magnesium-based hydrogen storage material with a core-shell structure coated with titanium oxide.

[0033] T...

Embodiment 1

[0039] (1) Prepare a 0.05 g / ml ethanol solution of tetrabutyl titanate, stir for 2 hours to make it evenly mixed;

[0040] (2) Weigh 0.2g of micro-nano magnesium particles, add it to 20ml of absolute ethanol, mix it into a suspension, and mix the 4ml tetrabutyl titanate ethanol solution prepared in (1) with the aforementioned solution at room temperature, Stir evenly and ultrasonically treat for 20 minutes;

[0041] (3) Under the condition of vigorous stirring, slowly drop 8 ml of 95% ethanol solution into the suspension of micro-nano magnesium particles, and let it stand for 12 hours;

[0042] (4) wash 3 times with absolute ethanol, vacuum dry, collect powder;

[0043] (5) Insulate the dried powder at 400°C and vacuum for 12 hours and slowly cool it to take out the powder sample, which is the magnesium particle material coated with titanium oxide, wherein the titanium oxide in the shell is TiO 2 , The thickness of the shell is about 30-60nm.

[0044] figure 1 MgTiO prepar...

Embodiment 2

[0046] (1) Prepare a 0.05 g / ml ethanol solution of tetrabutyl titanate, stir for 2 hours to make it evenly mixed;

[0047] (2) Weigh 0.2g of micro-nano magnesium particles, add it to 20ml of absolute ethanol, mix it into a suspension, and mix the 8ml tetrabutyl titanate ethanol solution prepared in (1) with the aforementioned solution at room temperature, Stir evenly and ultrasonically treat for 20 minutes;

[0048] (3) under the condition of vigorous stirring, slowly drop 16 ml of 95% ethanol solution into the suspension of micro-nano magnesium particles, and let it stand for 12 hours;

[0049] (4) wash 3 times with absolute ethanol, vacuum dry, collect powder;

[0050] (5) Insulate the dried powder at 400°C and vacuum for 12 hours and slowly cool it to take out the powder sample, which is the magnesium particle material coated with titanium oxide, wherein the titanium oxide in the shell is TiO 2 , The thickness of the shell is about 60-100nm.

[0051] figure 2 MgTiO pre...

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Abstract

The invention provides a magnesium-based hydrogen storage material of a core-shell structure. The magnesium-based hydrogen storage material of the core-shell structure is prepared from, by mass percent, 60% to 85% of magnesium particles and 15% to 40% of shell layer titanic oxide, and x in the shell layer titanic oxide TiOx is equal to 0.5 to 1.8. The magnesium particles are nano or micron particles, and the thickness of the shell layer titanic oxide ranges from 60 nm to 200 nm. According to a preparation method, a titanic oxide shell layer is prepared through a sol-gel method, the hydrogen absorption and desorption performance of magnesium can be effectively improved through the shell layer titanic oxide, and the core-shell structure is stable and resistant to oxidization in air. The magnesium-based hydrogen storage material of the core-shell structure is applied to solid hydrogen storage, the rate of hydrogen absorption and desorption can be effectively increased, and the temperature needed for the hydrogen absorption and desorption process can be reduced. The preparation method of the magnesium-based hydrogen storage material is relatively easy to operate, the resultant temperature is low, conditions are easy to control, and even coating of the shell layer of the magnesium-based hydrogen storage material can be achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, and relates to a titanium oxide material coated on the surface of nanometer or micrometer magnesium particles through a sol-gel method using titanium metal alkoxide as a precursor, in particular to a core-shell structure Magnesium-based hydrogen storage material and preparation method thereof. Background technique [0002] As the most basic power support for human survival and development in the 21st century, energy is one of the problems that need to be solved urgently in the world today. Hydrogen energy, as a clean and ideal secondary energy source, has attracted widespread attention from all over the world. Magnesium-based hydrogen storage materials have very broad application prospects due to their advantages of high hydrogen storage capacity, abundant raw materials, low price, light weight, and little environmental pollution. hydrogen storage alloy materials. For MgH 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
CPCB22F1/16
Inventor 王辉卢彦杉朱敏欧阳柳章刘江文胡仁宗曾美琴
Owner SOUTH CHINA UNIV OF TECH
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